code: def test_ragged_array(self):
      self.assertTrue(
          isinstance(dshape("3 * var * int32")[1], datashape.Var)
      )
  
imports: from __future__ import absolute_import, division, print_function
  import ctypes
  import unittest
  import pytest
  from datashader import datashape
  from datashader.datashape import dshape, error, DataShape, Record
label_desc: Use image node_id 15 for calling the TestDataShapeCreation obj's underlying member method code with example usage: obj.test_ragged_array() without return types